Syntax highlighting colors in documentation have poor visibility with dark color schemes

[haykam821]

The prefers-color-scheme: dark styles on the documentation site make the background brown, but the colors used for syntax highlighting seem to be unchanged. This results in a few hard-to-read text and background color combinations:

[printfn]

It's unfortunate pandoc doesn't have built-in support for dark mode. I've manually fixed that dark blue colour and had a quick scan through the rest of the docs, so it should be fine for now, but it'd be nice to have a proper fix for this eventually.